VARKON Version 1.15 1997-10-24

inv_on - Function

Geometrical function


Description

Returns the parameter value of a position on a line, arc or curve.

Syntax

inv_on(ref, p, alt)

REF	ref;
VECTOR	p;
INT	alt;

Principal parameters

ref	- Identity of line, arc or curve
p	- Position

Optional parameters

alt	- Alternative, default = 1

Return value

A FLOAT value equal to the parameter value of the specified position.

Example

inv_on(#5,vec(100,100))

The parameter value for which the position of #5 is equal to X=Y=100.

Comments

If p is not exactly on the referenced entity a position on the entity is calculated by enumerating all positions on the entity with a normal passing through p and selecting the solution specified by alt.